The inventories are unsold goods. The increase of inventories implies the declining of demand. The current oil stock is slightly over 2,000,000 Mbbl and the historical average of oil stock is 1,667,000 Mbbl. Especially, the oil stocks increased significantly in 2014 and 2015 and do not expect to decline anytime soon. The oil prices would not be able to increase if the stocks do not decrease.